An electrocardiogram (EKG or ECG) is a test that checks for problems with the electrical activity of your heart. An EKG translates the heart's electrical activity into line tracings on paper. The spikes and dips in the line tracings are called waves. See a picture of the EKG components and intervals .
The heart is a muscular pump made up of four chambers . The two upper chambers are called atria, and the two lower chambers are called ventricles. A natural electrical system causes the heart muscle to contract and pump blood through the heart to the lungs and the rest of the body. See a picture of the heart and its electrical system .
Why It Is Done
An electrocardiogram (EKG or ECG) is done to:
How To Prepare
Many medicines may change the results of this test. Be sure to tell your doctor about all the nonprescription and prescription medicines you take. If you take heart medicines, your doctor will tell you how to take your medicines before you have this test.
Remove all jewelry from your neck, arms, and wrists. Men are usually bare-chested during the test. Women may often wear a bra, T-shirt, or gown. You will be given a cloth or paper covering to use during the test.
Talk to your doctor about any concerns you have regarding the need for the test, its risks, how it will be done, or what the results will mean. To help you understand the importance of this test, fill out the medical test information form (What is a PDF document?) .
How It Is Done
An electrocardiogram (EKG or ECG) is usually done by a health professional, and the resulting EKG is interpreted by a doctor, such as an internist , family medicine doctor , electrophysiologist , cardiologist , anesthesiologist , or surgeon .
You may receive an EKG as part of a physical examination at your health professional's office or during a series of tests at a hospital or clinic. EKG equipment is often portable, so the test can be done almost anywhere. If you are in the hospital, your heart may be continuously monitored by an EKG system; this process is called telemetry.
During an EKG:
The test usually takes 5 to 10 minutes to complete.
How It Feels
The electrodes may feel cool when they are put on your chest. If you have a lot of hair on your chest, a small area may need to be shaved to put the electrodes on. When the electrodes are taken off, they may pull your skin a little.
There is no chance of problems while having an electrocardiogram (EKG or ECG). An EKG is a completely safe test. In most cases, there is no reason why you should not be able to get an EKG.
The electrodes are used to transfer an image of the electrical activity of your heart to tracing on paper. No electricity passes through your body from the machine, and there is no danger of getting an electrical shock.
An electrocardiogram (EKG or ECG) is a test that checks for problems with the electrical activity of your heart. An EKG translates the heart's electrical activity into line tracings on paper. The spikes and dips in the line tracings are called waves.
Your doctor will look at the pattern of spikes and dips on your electrocardiogram to check the electrical activity in different parts of your heart. The spikes and dips are grouped into different sections that show how your heart is working. See a picture that explains the EKG components and intervals .
What Affects the Test
Reasons you may not be able to have the test or why the results may not be helpful include:
What To Think About
Other Places To Get Help
Last Revised: September 11, 2012
Author: Healthwise Staff
U.S. Preventive Services Task Force (2004). Screening for coronary heart disease: Recommendation statement. Annals of Internal Medicine, 140(7): 569–572. Also available online: http://www.uspreventiveservicestaskforce.org/uspstf/uspsacad.htm.
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